J Rockett - The Dude (gut Shots)

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

J Rockett - The Dude (gut Shots)

Postby rafikian » 04 Nov 2016, 15:43

My friend has juste lent me his Fantabulous J Rockett The Dude, this peadl is AWESOME !!
Did take some pictures :)
this is a double sided PCB with 3 x 4558 smd IC
Pots are
Lvl = B50K
Ratio= A250K
Treble=B10K
Deep=C25K
I ll put the values of the Rs and Cs when possible.
Cheers
Rafik.
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Re: J Rockett - The Dude (gut Shots)

Postby MGaburriJazzDude » 23 Dec 2016, 16:16

It's just me, or there are too many OP Amps in there?
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Re: J Rockett - The Dude (gut Shots)

Postby induction » 23 Dec 2016, 16:55

Too many for what?
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Re: J Rockett - The Dude (gut Shots)

Postby alexradium » 23 Dec 2016, 17:01

induction wrote:Too many for what?
for a chicken brain...
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Re: J Rockett - The Dude (gut Shots)

Postby MoonWatcher » 23 Dec 2016, 21:27

MGaburriJazzDude wrote:It's just me, or there are too many OP Amps in there?

If it's mostly copied from an existing design, then 3 op amps would be 'just right.' :P
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Re: J Rockett - The Dude (gut Shots)

Postby MGaburriJazzDude » 24 Dec 2016, 00:39

I mean, aren't 6 op amps a lot for a traditional overdrive?
Are we in front of a totally new overdrive topology?

But, thinking about it a bit, it could be that they've used multiple gain stagesin series or something like that. I don't know, i will be amazed if someone told that finaly a boutique manufacture came up with a completely new overdrive design... It would be amazing, wouldn't it?


(Excuse my rough english...)
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Re: J Rockett - The Dude (gut Shots)

Postby alexradium » 24 Dec 2016, 13:39

MGaburriJazzDude wrote:I mean, aren't 6 op amps a lot for a traditional overdrive?
Are we in front of a totally new overdrive topology?

But, thinking about it a bit, it could be that they've used multiple gain stagesin series or something like that. I don't know, i will be amazed if someone told that finaly a boutique manufacture came up with a completely new overdrive design... It would be amazing, wouldn't it?


(Excuse my rough english...)
opamp or transistors are used for many different tasks,buffering,clipping,mixing,recovery,high,low or bandpass filters,differential,servo dc....
it could be one for input and output buffers,one for clipping,one for tone,one for a gyrator,who knows...anyway there are several pedals that use a lot of opamps,Blakstar and Tech21 most notably.

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Re: J Rockett - The Dude (gut Shots)

Postby MGaburriJazzDude » 24 Dec 2016, 15:21

alexradium wrote:
MGaburriJazzDude wrote:I mean, aren't 6 op amps a lot for a traditional overdrive?
Are we in front of a totally new overdrive topology?

But, thinking about it a bit, it could be that they've used multiple gain stagesin series or something like that. I don't know, i will be amazed if someone told that finaly a boutique manufacture came up with a completely new overdrive design... It would be amazing, wouldn't it?


(Excuse my rough english...)
opamp or transistors are used for many different tasks,buffering,clipping,mixing,recovery,high,low or bandpass filters,differential,servo dc....
it could be one for input and output buffers,one for clipping,one for tone,one for a gyrator,who knows...anyway there are several pedals that use a lot of opamps,Blakstar and Tech21 most notably.


You're right, i didn't think about it that way... :slap:

By the way, is there any clue of whats going on in that lil' black box?
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Re: J Rockett - The Dude (gut Shots)

Postby Saruman » 27 Dec 2016, 08:44

schematic?
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Re: J Rockett - The Dude (gut Shots)

Postby 1oldsidewinder » 31 Dec 2016, 21:50

Not all the op-amp stages may be in use. IIRC, the Blue Note only used half of a 4558. Another possibility might be a charge pump. Also the Dude's "ratio" control is supposed to be a clean blend. I guess a dual gang pot might be a clue. Just a guess but Rockett has had a lot of success with their Klones.
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Re: J Rockett - The Dude (gut Shots)

Postby matt239 » 20 Jan 2018, 07:15

Any idea how the thing works?
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